Means for applying adhesive to paper bags or the like

ABSTRACT

Means for applying adhesive to paper bags or the like in which a rotating cylinder carries an arcuate applicator member which intermittently comes into contact with a valve controlled adhesive dispenser head to receive adhesive therefrom and subsequently transfer it to a paper bag or the like moving along a conveyor bed.

United States Patent Kardon 1 June 27, 1972 [54] MEANS FOR APPLYING ADHESIVE T O PAPER BAGS OR THE LIKE [72] Inventor: Emanuel Kardon, c/o American Bug & Paper Corp, Grant and Ashton, Philadel phia, Pa. 19141 [22] Filed: Sept. 23, 1970 [21] Appl. No.: 74,665

[52] U.S. C1 ..1 18/221, 118/262 [51] Int. Cl. ..B05c U115 [58] Field ol Search ..40l/218, 220; 118/216, 221, 118/262, 222, 258, 212

[56] References Cited UNITED STATES PATENTS Limacher ..401/21 8 X 1,599,669 9/1926 Mitchell ..40 l/220 2,559,175 7/1951 Stoever ..1 18/221 X 2,896,569 7/1959 Ferguson et a1 ..1 18/221 X Primary liraminer-John P. Mclntosh Attorney-Smith, Harding, Earley & Follmer 57 ABSTRACT Means for applying adhesive to paper bags or the like in which a rotating cylinder carries an arcuate applicator member which intermittently comes into contact with a valve controlled adhesive dispenser head to receive adhesive therefrom and subsequently transfer it to a paper bag or the like moving along a conveyor bed.

7 Claims, 2 Drawing Figures PFA'TE NTEDJUW I972 Y\\\\\\\ .llv m. 9

ATTORNEYS MEANS FOR APPLYING ADHESIVE TO PAPER BAGS OR THE LIKE BACKGROUND OF THE INVENTION This invention relates to means for applying adhesive to paper bags or the like.

In the manufacture of various thin sheet-like articles, such as paper bags, it is desirable to apply a strip of adhesive intermittently to a desired location on successive articles moving along a conveyor bed, such as for example, in the manufacture of bags such as those disclosed in U.S. Pat. No. 2,496,796. In the forming of the bag bottom it is desirable to apply a strip of adhesive thereto at a desired location prior to the folding of the bag bottom together. While it would be desirable to do this by means of a valve controlled applicator, this has not proved workable because in order to apply the applicator directly to the bag there is required a certain pressure for opening the valve and this required pressure will cause the bag to distort resulting in the improper application of the adhesive.

SUMMARY OF THE INVENTION It is the general object of the invention to provide a means for the application of adhesive to paper bags or the like which employs a valve controlled adhesive dispenser and overcomes the problems of bag distortion discussed in the Background of the Invention.

Briefly stated, the adhesive applying means in accordance with the invention comprises an adhesive dispensing head including a normally closed valve means for controlling the dispensing of the adhesive therefrom, and means for transferring adhesive from the dispensing means to the paper bag or the like including a rotating cylinder means carrying an adhesive applicator member defining an arcuate applicating surface. The applicator member is constructed and arranged to contact the dispensing head to open the valve means so that adhesive is dispensed onto the applicating surface and to subsequently contact a paper bag or the like moving along a conveyor bed to transfer the adhesive from the applicating surface thereto.

BRIEF DESCRIPTION OF THE DRAWING FIG. I is a side elevation of the adhesive applying means in accordance with the invention; and

FIG. 2 is an enlarged view of a detail.

DESCRIPTION OF THE PREFERRED EMBODIMENT The adhesive applying means in accordance with the invention is shown in FIG. 1 as adapted for the application of a strip of adhesive to the bottom of a bag, indicated at 10, which is moved along a conveyor bed l2 by suitable means such as feed rollers (not shown) in the direction of the arrow. As shown in FIG. I the bag bottom is passing beneath a hold down finger 13 as is conventional in the art. The bag may be of the type disclosed in said US. Pat. No. 2,496,796.

Located above the conveyor bed is an adhesive supply means indicated generally at I4 and comprising a supply conduit 16 which passes from an elevated reservoir of adhesive (not shown) for connection to an adhesive dispensing head 18. The dispensing head 18 is mounted in a block member 20 extending transversely of the direction of the movement of the bag and supported between a pair of spaced bracket portions 22 of a support member 24 by means of a pair of mounting bolts 26 (only one of which is shown in FIG. 1 The mounting bolts 26 extend inwardly from the bracket portions 22 to engage the lateral ends of the block member 20 for adjustably securely positioning the same. The bracket portions 22 are spaced apart a distance approximating the length of the block member 20 and extend vertically upwardly from the inclined upper surface 28 of the support member 24. The support member 24 has a rectangular cutout 29 in the lower end thereof which receives a rectangular bar 30 which extends transversely across the bed 12. The support member 24 is adjustably secured in position on the bar 30 by means of a mounting screw 32. At its lateral ends the bar 30 is mounted on the main frame of the machine indicated at 34.

The dispenser head 18 is provided with a discharge nozzle 40 at the discharge end thereof which is shown in detail in FIG. 2. Within the nozzle 40 there is provided a conventional spring biased, normally closed ball valve means comprising a valve member 42 which cooperates with a valve seat 44 defining a discharge port in the end of the nozzle 40. A compression spring 46 is arranged to bias the valve member 42 toward contact with the valve seat 44 whereby the valve means is normally closed. The adhesive, which typically is a suitable emulsion adhesive, is supplied to the upstream side of the seat 42 by a suitable passage means, indicated, generally at 48, in applicator head 18. The upstream end of the passage means 48 communicates with the conduit 16 and the downstream end of this passage communicates with the valve chamber 49 containing the ball valve member 42.

Means are provided for transferring adhesive from the dispensing head 18 to the bag 10, such means comprising a transversely extending cylinder 50 mounted on a rotating shaft 52 the axis of which is indicated at A," said axis extending transversely above the conveyor bed 12 and being spaced approximately the same distance from the discharge end of the nozzle 40 and the conveyor bed 12. Mounted on the periphery of cylinder 50 are a pair of adhesive applicator members indicated generally at 54 and located at diametrically opposed positions as shown in FIG 1. Each of the applicator members 54 has a base portion 56 which conforms to the periphery of cylinder 50 and which receives a pair of mounting screws 58 which threadedly engage the cylinder 50 for mounting the member 54 thereto. Projecting radially outwardly from base portions 56 of each member 54 is a portion 60 having a segment-like configuration which defines an arcuate adhesive applicating surface 62, the center of curvature of which is the axis A" of rotating shaft 52. The width of surface 62 will approximate that of the port defined by the valve seat 44.

The parts are constructed and arranged so that during rotation of the cylinder 50'about the axis A, the surfaces 62 of members 54 will intermittently contact the ball valve member 42 as each member 54 passes the nozzle 40 to actuate the valve member 42 from a closed position to an open position. This is illustrated in FIG. 2 wherein the closed position is shown in full lines and the open position is shown in dotted lines. The construction and arrangement of parts is also such that when the member 54 subsequently moves to the vertically downwardly extending position shown in dotted lines in FIG. 1, the surface 62 contacts the bag 10 to apply adhesive thereto. It will be evident that the adhesive will be applied in a strip having longitudinal extent equal to the length of the arcuate surface 62 and a width corresponding to that of the surface As shown in FIG. 1 the feed line or longitudinal axis of the applicator means 14 indicated at 70 passes through the axis of rotation A of the cylinder 50 and arcuate surfaces 62. Also, the feed line 70 extends at an angle to the horizontal. This arrangement insures that the adhesive will be deposited properly onto the surfaces 62. It is noted that the head 18 is mounted on the bolts 26 to permit rotatable adjustment thereof so that the feed line 70 can be properly set as described above.

In the operation of the machine in accordance with the invention, the paper bags 10 will be fed successively along the bed 12 in the direction of the arrow and the cylinder 50 will be rotated continuously by shaft 52 in the proper timed relation so that as a bag 10 passes beneath cylinder 50 one of the members 54 will contact the bag 10 at the proper location, as is shown by the dotted line position in FIG. 1. For each rotation of the cylinder 50 two bags will pass the applicating position. It will be apparent that the operation is such that a member 54 will move past the nozzle 40 to open the valve means and pick up a quantity of adhesive and then subsequently rotate around with the cylinder 50 to the dotted line position shown in FIG. I to transfer this quantity of adhesive onto the paper bag 10. This involves the intermittent application of the adhesive.

An advantage of the means in accordance with the invention is that there is very little wasted adhesive by reason of the operation of the ball valve means to only dispense adhesive when required. Moreover, by the utilization of the intermediate transfer means involving cylinder 50 and members 54, it is possible to set up the parts so that adhesive may be applied to the bags at the proper pressure and without any distortion.

It will be apparent that various changes may be made in the construction and arrangement of parts without departing from the scope of the invention as defined by the following claims.

lclaim:

1. Means for applying adhesive to paper bags or the like moving along a conveyor bed comprising adhesive dispensing means having a dispensing head for discharging adhesive, said dispensing head including a valve means for controlling the flow of adhesive dispensed therefrom, said valve means being normally in a closed position and movable from said closed position to an open position, and means for transferring adhesive from said dispensing means to the paper bag or the like including a continuously rotating cylinder means mounted for rotation about an axis spaced a fixed predetermined distance from the conveyor bed and said dispensing head, an adhesive applicator member carried by said cylinder for rotation therewith and defining an applicating surface extending on an are extending about said cylinder axis, said adhesive dispensing means including means mounting said dispensing head above the conveyor bed in a fixed relation with respect to said applicator member, said applicator member being constructed and arranged to contact said dispensing head to actuate said valve means from said closed position to said open position so that adhesive is dispensed onto said applicating surface and to subsequently contact a paper bag or the like moving along the conveyor bed to apply the adhesive received on said applicating surface from said applicator head to the paper bag or the like intermittently during each rotation of said cylinder.

2. Adhesive applying means according to claim 1 wherein said applicator head has a nozzle at the discharge end thereof,

said valve means comprises a ball valve member biased into contact with a valve seat at the end of said nozzle and encircling an adhesive discharge port, said ball valve member projecting from the end of the applicator head, and said applicating surface being constructed and arranged to extend in a circular are less than half of the circumference of a circle and to come into contact with said ball valve member during rotation of said cylinder to move the same from a closed to an open position to permit adhesive to be dispensed through said port onto said applicating surface.

3. An adhesive applying means according to claim 2 including means for adjustably mounting said applicator head to pivot the longitudinal axis thereof to position the feed line thereof to pass through said cylinder axis and at an angle to the horizontal.

4. An adhesive applying means according to claim 3 wherein there is provided a second applicator member constructed similarly to said first-mentioned applicator member, said applicating surface having a width approximating the size of said adhesive discharge port, said applicator members being located at diametrically opposed locations on said cylinder means to apply adhesive strips corresponding to the length and width of said applicating surface at equally spaced intervals to bags moving along the conveyor bed.

5. Adhesive applying means according to claim 3 wherein said applicator member is formed on a projection mounted on said cylinder means, said projection having a segment-like configuration.

6. An adhesive applying means according to claim 2 wherein there is provided a second applicator member constructed similarly to said first-mentioned applicator member, said applicator members being located at diametrically opposed locations on said cylinder means to apply adhesive strips corresponding to the length of said arcs at equally spaced intervals to bags moving along the conveyor bed.

7. Adhesive applying means according to claim 1 wherein said applicator member is formed on a projection mounted on said cylinder means, said projection having a segment-like configuration. 

1. Means for applying adhesive to paper bags or the like moving along a conveyor bed comprising adhesive dispensing means having a dispensing head for discharging adhesive, said dispensing head including a valve means for controlling the flow of adhesive dispensed therefrom, said valve means being normally in a closed position and movable from said closed position to an open position, and means for transferring adhesive from said dispensing means to the paper bag or the like including a continuously rotating cylinder means mounted for rotation about an axis spaced a fixed predetermined distance from the conveyor bed and said dispensing head, an adhesive applicator member carried by said cylinder for rotation therewith and defining an applicating surface extending on an arc extending about said cylinder axis, said adhesive dispensing means including means mounting said dispensing head above the conveyor bed in a fixed relation with respect to said applicator member, said applicator member being constructed and arranged to contact said dispensing head to actuate said valve means from said closed position to said open position so that adhesive is dispensed onto said applicating surface and to subsequently contact a paper bag or the like moving along the conveyor bed to apply the adhesive received on said applicating surface from said applicator head to the paper bag or the like intermittently during each rotation of said cylinder.
 2. Adhesive applying means according to claim 1 wherein said applicator head has a nozzle at the discharge end thereof, said valve means comprises a ball valve member biased into contact with a valve seat at the end of said nozzle and encircling an adhesive discharge port, said ball valve member projecting from the end of the applicator head, and said applicating surface being constructed and arranged to extend in a circular arc less than half of the circumference of a circle and to come into contact with said ball valve member during rotation of said cylinder to move the same from a closed to an open position to permit adhesive to be dispensed through said port onto said applicating surface.
 3. An adhesive applying means according to claim 2 including means for adjustably mounting said applicator head to pivot the longitudinal axis thEreof to position the feed line thereof to pass through said cylinder axis and at an angle to the horizontal.
 4. An adhesive applying means according to claim 3 wherein there is provided a second applicator member constructed similarly to said first-mentioned applicator member, said applicating surface having a width approximating the size of said adhesive discharge port, said applicator members being located at diametrically opposed locations on said cylinder means to apply adhesive strips corresponding to the length and width of said applicating surface at equally spaced intervals to bags moving along the conveyor bed.
 5. Adhesive applying means according to claim 3 wherein said applicator member is formed on a projection mounted on said cylinder means, said projection having a segment-like configuration.
 6. An adhesive applying means according to claim 2 wherein there is provided a second applicator member constructed similarly to said first-mentioned applicator member, said applicator members being located at diametrically opposed locations on said cylinder means to apply adhesive strips corresponding to the length of said arcs at equally spaced intervals to bags moving along the conveyor bed.
 7. Adhesive applying means according to claim 1 wherein said applicator member is formed on a projection mounted on said cylinder means, said projection having a segment-like configuration. 